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Mission Foods’ wireless supply chain evolution

Over the past six years, the tortilla manufacturer has rolled out a combination of wireless technologies—from handhelds, to wireless networks, to RFID—to automate transactions, track assets, and manage labor and inventory in its distribution and warehouse operations. Here’s how they made it happen.

An independent distributor uses a handheld computer with attached portable printer to wirelessly transmit delivery information to Mission Foods in real time and generate invoices at a grocery retailer’s store.

By Maida Napolitano, Contributing Editor
April 01, 2011

Three wireless radios in one
Like worker bees in a colony, Mission’s independent distributors are tasked with delivering the company’s products to stores and producing invoices requiring a customer’s signature before moving on to the next store. 

“In the past, we’d have to wait for the distributors to establish a modem connection to download invoices and get an update, or we’d wait for them to come to the office,” says Valdes. Hard copies of invoices that were dropped off had to be manually scanned for electronic processing—not a small task when you’re dealing with about 30,000 documents a day nationwide.

In 2005, having worked with Intermec since 1996, Valdes and his team went back to its solution provider to see if it had a handheld computer that could simultaneously support three forms of wireless communication: wide area wireless connectivity to transmit invoice and delivery data in real time from distributors in the field to Mission’s SAP systems; a wireless LAN 802.11b-standard connection for use within its facilities; and Bluetooth connectivity to print signed paper invoices at a customer site from a portable printer. 

According to Valdes, the provider’s handhelds clearly fit the bill; and in 2006, these mobile devices were rolled out to Mission’s independent distributors who could now generate invoices for customers on the spot. 

In this system, the capture of a customer’s signature on the handheld automatically triggers a wireless transmission that sends the invoice data to Mission Foods over AT&T’s wide range area network. If out of network coverage, the system will automatically retry to send the data. If any transactions haven’t been transmitted when the distributor returns to the DC, the DC’s wireless LAN is used to send the data from the handheld.

Although the biggest benefit to Mission Foods might be the real-time exchange of accurate transactions, electronically capturing signatures on invoices has also eliminated the need to scan and process 30,000 documents. More importantly, independent distributors don’t take as much of the customer’s time to complete deliveries, elevating service levels on delivery routes.

image Container tracking with RFID
After offering independent distributors these new handhelds, Valdes and his team switched gears in late 2008 to focus on the containers used to transport products to stores. The company, in response to sustainability initiatives, had been gradually replacing its corrugated boxes with returnable plastic containers (RPCs).

With these containers costing $8 each, the company’s ability to be “green” relied heavily upon distributors returning RPCs after product delivery—easier said than done. Nearly 100 percent of the RPCs were being replaced each year at a loss of $3 million. 

While keeping track of containers leaving may have been easy, tracking them coming back proved difficult. “Most distributors would drop the empties outside the warehouse, but facilities lacked the manpower to check-in and count the trays that were returning,” says Valdes. He needed a system that wouldn’t create extra work for warehouse personnel, follow the natural picking and shipping process, and still track who was returning the containers.

Valdes and Intermec set up a “proof of concept” in Mission’s 150,000 square-foot Dallas facility to determine whether using RFID to track containers would be feasible.

They attached an adaptor to a DSD handheld, making it an RFID reader.

“We put a fairly expensive RFID tag on a thousand containers so we knew it would read, and then we successfully tracked them with this handheld coming and going,” recalls Intermec’s Doyle. Engineers then tested the readability of less expensive tags on containers filled with Mission’s products until finally recommending an inexpensive, but reliable weather-resistant, polyester label with an RFID tag built into it. Placing RFID reader portals on each dock door would have been cost-prohibitive, so Mission’s team located a minimal number of portals along the workers’ most travelled paths. 

To facilitate tagging each container, Mission printed the containers’ RFID labels in-house before sending them to the RPC manufacturer for application to the containers before they arrive at Mission’s facilities. Before loading onto the independent distributor’s truck, a worker prints and attaches an RFID paper tag on the pallet indicating which independent distributor gets the pallet along with the number of containers associated with the pallet. 

Lift truck drivers then transport product through an outbound portal that automatically records both the pallet and container codes. Upon the independent distributor’s return, the trays are processed through an inbound portal near the docks where lift trucks must drive before unloading the empty containers in the warehouse. Because every reader has a unique IP address, Mission knows where the containers were read and if they were leaving or coming back to the facility.

The only issue, according to Valdes, is the inadvertent reading of stray tags from product stored within the vicinity of the portal—a problem that’s common in many RFID applications. Valdes and his team installed filtering software that could identify these stray tags and eliminate them from tracking reports. 

In July 2009, Dallas went live with three strategically placed portals. Soon after that, portals were installed in Houston and San Antonio in just one week. Mission Foods plans to continue rolling out this RFID system to all of its DCs and plants through 2012.

The system, including readers, tags, and software, cost about $100,000 for all three Texas facilities—which move a total of 20,000 containers per day. For 2010, these facilities saved a combined $700,000 by switching from corrugated, resulting in a return on investment of only a few months. 

Taking wireless to the warehouse
Valdes and his team’s foray into wireless technology continues to evolve over time. In 2009, they decided to concentrate on Mission’s warehouses that still used paper pick lists to pick full cartons of product onto a pallet. 

For years, this paper-based approach caused mispicks and inhibited automatic traceability for recalls. Many times, the oldest products weren’t picked first, resulting in some items going to scrap due to expired sell-by dates.

To address these issues the team chose another handheld computer capable of scanning barcodes up to 50 feet away. The handheld is equipped with a terminal emulator software that mimics the data entry terminal on Mission’s host system, essentially making the handheld a smaller version of the system. 

With these wireless devices, a worker scans the pick location and the product to make sure he or she is picking the correct product and quantity. The handheld then directs the worker to the next pick location. 

Using these wireless handheld scanners in the warehouse has allowed real-time tracking of inventory, labor productivity and delivery status, while seamlessly interfacing with Mission’s SAP systems. In late 2009, they went live with the first location, adding two more locations in 2010.

About the Author

Maida Napolitano
Contributing Editor

Maida Napolitano has worked as a Senior Engineer for various consulting companies specializing in supply chain, logistics, and physical distribution since 1990. She’s is the principal author for the following publications: Using Modeling to Solve Warehousing Problems (WERC); Making the Move to Cross Docking (WERC); The Time, Space & Cost Guide to Better Warehouse Design (Distribution Group); and Pick This! A Compendium of Piece-Pick Process Alternatives (WERC). She has worked for clients in the food, health care, retail, chemical, manufacturing and cosmetics industries, primarily in the field of facility layout and planning, simulation, ergonomics, and statistic analysis. She holds BS and MS degrees in Industrial Engineering from the University of the Philippines and the New Jersey Institute of Technology, respectively. She can be reached at .(JavaScript must be enabled to view this email address).

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